package com.example.eduservice.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.eduservice.entity.EduCourse;
import com.example.eduservice.entity.EduCourseDescription;
import com.example.eduservice.entity.frontvo.CourseWebVo;
import com.example.eduservice.entity.vo.CourseInfoVo;
import com.example.eduservice.entity.vo.CoursePublishVo;
import com.example.eduservice.entity.frontvo.CourseFrontVo;
import com.example.eduservice.mapper.EduCourseMapper;
import com.example.eduservice.service.EduChapterService;
import com.example.eduservice.service.EduCourseDescriptionService;
import com.example.eduservice.service.EduCourseService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.eduservice.service.EduVideoService;
import com.example.servicebase.exceptionhandler.GuliException;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-08-30
 */
@Service
public class EduCourseServiceImpl extends ServiceImpl<EduCourseMapper, EduCourse> implements EduCourseService {

    //课程描述的注入
    @Autowired
    private EduCourseDescriptionService courseDescriptionService;

    //注入小节和章节service
    @Autowired
    private EduVideoService eduVideoService;

    @Autowired
    private EduChapterService eduChapterService;


    @Override
    public String saveCourseInfo(CourseInfoVo courseInfoVo) {

        //1、向课程表添加课程基本信息
        //courseInfoVo对象转换deuCourse对象
        EduCourse eduCourse=new EduCourse();
        BeanUtils.copyProperties(courseInfoVo,eduCourse);
        int insert = baseMapper.insert(eduCourse);
        if(insert==0){
            throw new GuliException(20001,"添加课程信息失败");
        }

        //获取添加之后课程id
        String cid=eduCourse.getId();

        //2、向课程简介表添加课程简介
        EduCourseDescription courseDescription = new EduCourseDescription();
        courseDescription.setDescription(courseInfoVo.getDescription());
        //设置描述id关联课程id（两表之间是一对一关系）
        courseDescription.setId(cid);
        courseDescriptionService.save(courseDescription);

        return cid;
    }

    @Override
    public CourseInfoVo getCourseInfo(String courseId) {

        //1、查询课程表
        EduCourse eduCourse = baseMapper.selectById(courseId);
        CourseInfoVo courseInfoVo = new CourseInfoVo();
        BeanUtils.copyProperties(eduCourse,courseInfoVo);

        //2、查询简介表
        EduCourseDescription courseDescription = courseDescriptionService.getById(courseId);
        courseInfoVo.setDescription(courseDescription.getDescription());

        return courseInfoVo;
    }

    //修改课程信息
    @Override
    public void updateCourseInfo(CourseInfoVo courseInfoVo) {
        //1、修改课程表
        EduCourse eduCourse = new EduCourse();
        BeanUtils.copyProperties(courseInfoVo,eduCourse);
        int update = baseMapper.updateById(eduCourse);
        if (update <= 0){
            throw new GuliException(20001,"修改课程信息失败");
        }

        //2、修改描述信息
        EduCourseDescription description = new EduCourseDescription();
        description.setDescription(courseInfoVo.getDescription());
        description.setId(courseInfoVo.getId());
        courseDescriptionService.updateById(description);

    }

    //根据课程id查询课程确认信息
    @Override
    public CoursePublishVo publisCourseInfo(String id) {
        //调用mapper
        CoursePublishVo pulishCourseInfo = baseMapper.getPulishCourseInfo(id);

        return pulishCourseInfo;
    }

    //删除课程
    @Override
    public void removeCourse(String courseId) {
         //1、根据课程id删除小节
          eduVideoService.removeVideoByCourseId(courseId);
        //2、根据课程id删除章节
         eduChapterService.removeChapterByCourseId(courseId);
        //3、根据课程id删除描述
       courseDescriptionService.removeById(courseId);
        //4、根据课程id删除课程本身
        int result = baseMapper.deleteById(courseId);
        if(result==0){    //失败返回
            throw new GuliException(20001,"删除失败");
        }

    }

    //查询带分页查询课程
    @Override
    public Map<String, Object> getCourseFrontList(Page<EduCourse> pageParam, CourseFrontVo courseQuery) {

        QueryWrapper<EduCourse> queryWrapper = new QueryWrapper<>();
        if (!StringUtils.isEmpty(courseQuery.getSubjectParentId())) { //一级分类
            queryWrapper.eq("subject_parent_id",
                    courseQuery.getSubjectParentId());
        }
        if (!StringUtils.isEmpty(courseQuery.getSubjectId())) { //二级分类
            queryWrapper.eq("subject_id", courseQuery.getSubjectId());
        }
        if (!StringUtils.isEmpty(courseQuery.getBuyCountSort())) {
            queryWrapper.orderByDesc("buy_count");
        }
        if (!StringUtils.isEmpty(courseQuery.getGmtCreateSort())) {
            queryWrapper.orderByDesc("gmt_create");
        }
        if (!StringUtils.isEmpty(courseQuery.getPriceSort())) {
            queryWrapper.orderByDesc("price");
        }
        baseMapper.selectPage(pageParam, queryWrapper);
        List<EduCourse> records = pageParam.getRecords();
        long current = pageParam.getCurrent();
        long pages = pageParam.getPages();
        long size = pageParam.getSize();
        long total = pageParam.getTotal();
        boolean hasNext = pageParam.hasNext();
        boolean hasPrevious = pageParam.hasPrevious();
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("items", records);
        map.put("current", current);
        map.put("pages", pages);
        map.put("size", size);
        map.put("total", total);
        map.put("hasNext", hasNext);
        map.put("hasPrevious", hasPrevious);

        return map;

    }

    //根据课程id，编写sql语句查询课程信息
    @Override
    public CourseWebVo getBaseCourseInfo(String courseId) {

        return baseMapper.getBaseCourseInfo(courseId);
    }

}
